<h2>File Contents: //usr/include/c++/8/bits/nested_exception.h</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//usr/include/c++/8/bits/nested_exception.h'><textarea name='file_content' rows='10' cols='50'>// Nested Exception support header (nested_exception class) for -*- C++ -*-

// Copyright (C) 2009-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file bits/nested_exception.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{exception}
 */

#ifndef _GLIBCXX_NESTED_EXCEPTION_H
#define _GLIBCXX_NESTED_EXCEPTION_H 1

#pragma GCC visibility push(default)

#if __cplusplus &lt; 201103L
# include &lt;bits/c++0x_warning.h&gt;
#else

#include &lt;bits/c++config.h&gt;
#include &lt;bits/move.h&gt;

extern &quot;C++&quot; {

namespace std
{
  /**
   * @addtogroup exceptions
   * @{
   */

  /// Exception class with exception_ptr data member.
  class nested_exception
  {
    exception_ptr _M_ptr;

  public:
    nested_exception() noexcept : _M_ptr(current_exception()) { }

    nested_exception(const nested_exception&amp;) noexcept = default;

    nested_exception&amp; operator=(const nested_exception&amp;) noexcept = default;

    virtual ~nested_exception() noexcept;

    [[noreturn]]
    void
    rethrow_nested() const
    {
      if (_M_ptr)
	rethrow_exception(_M_ptr);
      std::terminate();
    }

    exception_ptr
    nested_ptr() const noexcept
    { return _M_ptr; }
  };

  template&lt;typename _Except&gt;
    struct _Nested_exception : public _Except, public nested_exception
    {
      explicit _Nested_exception(const _Except&amp; __ex)
      : _Except(__ex)
      { }

      explicit _Nested_exception(_Except&amp;&amp; __ex)
      : _Except(static_cast&lt;_Except&amp;&amp;&gt;(__ex))
      { }
    };

  // [except.nested]/8
  // Throw an exception of unspecified type that is publicly derived from
  // both remove_reference_t&lt;_Tp&gt; and nested_exception.
  template&lt;typename _Tp&gt;
    [[noreturn]]
    inline void
    __throw_with_nested_impl(_Tp&amp;&amp; __t, true_type)
    {
      using _Up = typename remove_reference&lt;_Tp&gt;::type;
      throw _Nested_exception&lt;_Up&gt;{std::forward&lt;_Tp&gt;(__t)};
    }

  template&lt;typename _Tp&gt;
    [[noreturn]]
    inline void
    __throw_with_nested_impl(_Tp&amp;&amp; __t, false_type)
    { throw std::forward&lt;_Tp&gt;(__t); }

  /// If @p __t is derived from nested_exception, throws @p __t.
  /// Else, throws an implementation-defined object derived from both.
  template&lt;typename _Tp&gt;
    [[noreturn]]
    inline void
    throw_with_nested(_Tp&amp;&amp; __t)
    {
      using _Up = typename decay&lt;_Tp&gt;::type;
      using _CopyConstructible
	= __and_&lt;is_copy_constructible&lt;_Up&gt;, is_move_constructible&lt;_Up&gt;&gt;;
      static_assert(_CopyConstructible::value,
	  &quot;throw_with_nested argument must be CopyConstructible&quot;);
      using __nest = __and_&lt;is_class&lt;_Up&gt;, __bool_constant&lt;!__is_final(_Up)&gt;,
			    __not_&lt;is_base_of&lt;nested_exception, _Up&gt;&gt;&gt;;
      std::__throw_with_nested_impl(std::forward&lt;_Tp&gt;(__t), __nest{});
    }

  // Determine if dynamic_cast&lt;const nested_exception&amp;&gt; would be well-formed.
  template&lt;typename _Tp&gt;
    using __rethrow_if_nested_cond = typename enable_if&lt;
      __and_&lt;is_polymorphic&lt;_Tp&gt;,
	     __or_&lt;__not_&lt;is_base_of&lt;nested_exception, _Tp&gt;&gt;,
		   is_convertible&lt;_Tp*, nested_exception*&gt;&gt;&gt;::value
    &gt;::type;

  // Attempt dynamic_cast to nested_exception and call rethrow_nested().
  template&lt;typename _Ex&gt;
    inline __rethrow_if_nested_cond&lt;_Ex&gt;
    __rethrow_if_nested_impl(const _Ex* __ptr)
    {
      if (auto __ne_ptr = dynamic_cast&lt;const nested_exception*&gt;(__ptr))
	__ne_ptr-&gt;rethrow_nested();
    }

  // Otherwise, no effects.
  inline void
  __rethrow_if_nested_impl(const void*)
  { }

  /// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
  template&lt;typename _Ex&gt;
    inline void
    rethrow_if_nested(const _Ex&amp; __ex)
    { std::__rethrow_if_nested_impl(std::__addressof(__ex)); }

  // @} group exceptions
} // namespace std

} // extern &quot;C++&quot;

#endif // C++11

#pragma GCC visibility pop

#endif // _GLIBCXX_NESTED_EXCEPTION_H
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